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The U.S. captured the operative in Iraq three weeks ago

At the request of the Pentagon, CNN initially withheld publishing the detainee's connection to ISIS' chemical weapons program

(CNN)The U.S. military has conducted airstrikes against targets it believes are crucial to ISIS' chemical weapons program based on information provided by a senior ISIS operative involved in chemical weapons, several U.S. officials told CNN.

The U.S. captured the operative in Iraq three weeks ago, the first since a team of Special Operations forces recently began operating in northern Iraq.

Officials told CNN that his name is Sleiman Daoud Al-Bakkar. One official called him "the key leader," but others could not say if he runs the entire chemical weapons program for ISIS.

The information he provided to interrogators has given the U.S. enough information to begin striking ISIS areas in Iraq associated with the group's chemical weapons program. One U.S. official said the goal is to locate, target and carry out strikes that will result in the destruction of ISIS's entire chemical weapons enterprise -- mainly mustard agent ISIS produces itself.

It was not immediately clear if the U.S. was able to strike all of the necessary targets. Intelligence and surveillance of the targets had indicated in some Iraqi locations that civilians were present at prospective sites, officials told CNN.

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While the goal is to end ISIS' capability to manufacture and use mustard agent, the actual targets being struck include people, facilities and vehicles. The agent itself is made in relatively small quantities and has a fairly short shelf life, the U.S. government believes.

The program is one the U.S. military has been tracking, with Defense Secretary Ash Carter saying last month the Pentagon was prepared to strike against it.

"It's something we watch very closely and it's something we take action against," Carter said in an interview that aired on PBS.

Since the weekend, the U.S. has struck what it is calling "improvised weapons facilities" and other targets near Mosul, Iraq, but officials would not say if these were chemical weapons sites.

At the request of the Pentagon, CNN initially withheld publishing the detainee's connection to ISIS' chemical weapons program because defense officials said disclosing that would risk alerting ISIS to potential airstrike targets. With the chemical weapons program undisturbed, it would allow ISIS to use the weapons to strike civilians, troops the U.S. supports, and possibly even U.S. troops.

Officials would not explain why they believed the detention itself hadn't jeopardized the airstrikes, or why the U.S. military believes ISIS had not noticed the captured operative had gone missing from its ranks. However, the operative is said to have regularly moved around in Iraq, and officials said they still believe his capture was unknown to ISIS.

U.S. Special Operations forces captured the operative more than three weeks ago. He has been held and interrogated in Irbil, Iraq, for any information he has about the chemical weapons program and the location of other key ISIS personnel or weapons stocks. While there are other ISIS operatives involved in the program, the U.S. believes at this point that the captured man is crucial to understanding this dangerous wing of the organization.

The U.S. has long said any ISIS operatives captured by U.S. troops would only be held for a short time and then turned over to either the Iraqis or the Kurds.

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The operative was captured in one of the first missions of the so-called Expeditionary Targeting Forces. It is a group of some 200 Special Operations troops assembled in northern Iraq to gather intelligence and pursue ISIS operatives on the ground by either capturing or killing them in Iraq, and eventually in Syria. Carter recently acknowledged the ETF is "having an effect and operating.

"It's a tool that we introduced as part of our -- the accelerated operations to conduct raids of various kinds, seizing places and people, freeing hostages and prisoners of ISIL, and making it such that ISIL has to fear that anywhere, anytime, it may be struck," he said in late February, using a different name for ISIS.

The U.S. went after this particular individual due to concerns about the "skills and intent" he has, one of the officials said. The mission to capture him was specifically tailored to the location where he was, and was designed to allow troops to be able to seize him. U.S. Special Operations forces were certain he was at the location in Iraq after covertly surveying it for some days.

The U.S. intelligence community has been tracking a number of confirmed chemical attacks by ISIS where powdered mustard agent was used in artillery shells, the official said. The most recent attack was a month ago.

The U.S. intelligence community has confirmed 12 cases of the use of mustard agent. Three other cases are suspected. They include locations in both Syria and Iraq. The majority of the cases have been in Syria, some as far west as the Maraa line where fighting has raged. Other attacks have occurred across Iraq, including Sinjar Mountain and the area around Mosul, as well as locations further south towards Baghdad.

However, U.S. officials are somewhat downplaying the attacks, saying they believe any deaths were a result of being hit by artillery, not the agent itself.

Since interrogations of the detainee began, U.S. Special Operations forces have been using the information he has provided to begin to locate targets.

Photos:The ISIS terror threat

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Wounded passengers are treated following a suicide bombing at the Brussels Airport on March 22, 2016. The attacks on the airport and a subway killed 32 people and wounded more than 300. ISIS claims its "fighters" launched the attacks in the Belgian capital.

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Syrians gather at the site of a double car bomb attack in the Al-Zahraa neighborhood of the Homs, Syria, on February 21, 2016. Multiple attacks in Homs and southern Damascus kill at least 122 and injure scores, according to the state-run SANA news agency. ISIS claimed responsibility.

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Syrian pro-government forces gather at the site of a deadly triple bombing Sunday, January 31, in the Damascus suburb of Sayeda Zeynab. ISIS claimed responsibility for the attack, according to a statement circulating online from supporters of the terrorist group.

Wounded people are helped outside the Bataclan concert hall in Paris following a series of coordinated attacks in the city on Friday, November 13. The militant group ISIS claimed responsibility for the attacks, which killed at least 130 people and wounded hundreds more.

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Emergency personnel and civilians gather at the site of a twin suicide bombing in Beirut, Lebanon, on Thursday, November 12. The bombings killed at least 43 people and wounded more than 200 more. ISIS appeared to claim responsibility in a statement posted on social media.

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Smoke rises over the northern Iraqi town of Sinjar on November 12. Kurdish Iraqi fighters, backed by a U.S.-led air campaign, retook the strategic town, which ISIS militants overran last year. ISIS wants to create an Islamic state across Sunni areas of Iraq and Syria.

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Syrian government troops walk inside the Kweiras air base on Wednesday, November 11, after they broke a siege imposed by ISIS militants.

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Members of the Egyptian military approach the wreckage of a Russian passenger plane Sunday, November 1, in Hassana, Egypt. The plane crashed the day before, killing all 224 people on board. ISIS claimed responsibility for downing the plane, but the group's claim wasn't immediately verified.

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An explosion rocks Kobani, Syria, during a reported car bomb attack by ISIS militants on Tuesday, October 20.

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Shiite fighters, fighting alongside Iraqi government forces, fire a rocket at ISIS militants as they advance toward the center of Baiji, Iraq, on Monday, October 19.

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Smoke rises above a damaged building in Ramadi, Iraq, following a coalition airstrike against ISIS positions on Saturday, August 15.

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Iraqi men look at damage following a bomb explosion that targeted a vegetable market in Baghdad on Thursday, August 13. ISIS claimed responsibility for the attack.

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In this image taken from social media, an ISIS fighter holds the group's flag after the militant group overran the Syrian town of al-Qaryatayn on Thursday, August 6, the London-based Syrian Observatory for Human Rights reported. ISIS uses modern tools such as social media to promote reactionary politics and religious fundamentalism. Fighters are destroying holy sites and valuable antiquities even as their leaders propagate a return to the early days of Islam.

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An ISIS fighter poses with spoils purportedly taken after capturing the Syrian town of al-Qaryatayn.

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Smoke rises as Iraqi security forces bomb ISIS positions in the eastern suburbs of Ramadi, Iraq, on August 6.

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Buildings reduced to piles of debris can be seen in the eastern suburbs of Ramadi on August 6.

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The governor of the Asir region in Saudi Arabia, Prince Faisal bin Khaled bin Abdulaziz, left, visits a man who was wounded in a suicide bombing attack on a mosque in Abha, Saudi Arabia, on August 6. ISIS claimed responsibility for the explosion, which killed at least 13 people and injured nine others.

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Saudi officials and investigators check the inside of the mosque on August 6.

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Mourners in Gaziantep, Turkey, grieve over a coffin Tuesday, July 21, during a funeral ceremony for the victims of a suspected ISIS suicide bomb attack. That bombing killed at least 31 people in Suruc, a Turkish town that borders Syria. Turkish authorities blamed ISIS for the attack.

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Protesters in Istanbul carry anti-ISIS banners and flags to show support for victims of the Suruc suicide blast during a demonstration on Monday, July 20.

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People in Ashmoun, Egypt, carry the coffin for 1st Lt. Mohammed Ashraf, who was killed when the ISIS militant group attacked Egyptian military checkpoints on Wednesday, July 1. At least 17 soldiers were reportedly killed, and 30 were injured.

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Syrians wait near the Turkish border during clashes between ISIS and Kurdish armed groups in Kobani, Syria, on Thursday, June 25. The photo was taken in Sanliurfa, Turkey. ISIS militants disguised as Kurdish security forces infiltrated Kobani on Thursday and killed "many civilians," said a spokesman for the Kurds in Kobani.

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Residents examine a damaged mosque after an Iraqi Air Force bombing in the ISIS-seized city of Falluja, Iraq, on Sunday, May 31. At least six were killed and nine others wounded during the bombing.

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People search through debris after an explosion at a Shiite mosque in Qatif, Saudi Arabia, on Friday, May 22. ISIS claimed responsibility for the attack, according to tweets from ISIS supporters, which included a formal statement from ISIS detailing the operation.

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Iraqi soldiers fire their weapons toward ISIS group positions in the Garma district, west of the Iraqi capital of Baghdad, on Sunday, April 26. Pro-government forces said they had recently made advances on areas held by Islamist jihadists.

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A member of Afghanistan's security forces stands at the site where a suicide bomber on a motorbike blew himself up in front of the Kabul Bank in Jalalabad, Afghanistan, on Saturday, April 18. ISIS claimed responsibility for the attack. The explosion killed at least 33 people and injured more than 100 others, a public health spokesman said.

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Iraqi counterterrorism forces patrol in Ramadi on April 18.

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Thousands of Iraqis cross a bridge over the Euphrates River to Baghdad as they flee Ramadi on Friday, April 17.

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Yazidis embrace after being released by ISIS south of Kirkuk, Iraq, on Wednesday, April 8. ISIS released more than 200 Yazidis, a minority group whose members were killed, captured and displaced when the Islamist terror organization overtook their towns in northern Iraq last summer, officials said.

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Kurdish Peshmerga forces help Yazidis as they arrive at a medical center in Altun Kupri, Iraq, on April 8.

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A Yazidi woman mourns for the death of her husband and children by ISIS after being released south of Kirkuk on April 8. ISIS is known for killing dozens of people at a time and carrying out public executions, crucifixions and other acts.

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People in Tikrit inspect what used to be a palace of former President Saddam Hussein on April 3.

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On April 1, Shiite militiamen celebrate the retaking of Tikrit, which had been under ISIS control since June. The push into Tikrit came days after U.S.-led airstrikes targeted ISIS bases around the city.

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Iraqi security forces launch a rocket against ISIS positions in Tikrit on Monday, March 30.

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The parents of 19-year-old Mohammed Musallam react at the family's home in the East Jerusalem Jewish settlement of Neve Yaakov on Tuesday, March 10. ISIS released a video purportedly showing a young boy executing Musallam, an Israeli citizen of Palestinian descent who ISIS claimed infiltrated the group in Syria to spy for the Jewish state. Musallam's family told CNN that he had no ties with the Mossad, Israel's spy agency, and had, in fact, been recruited by ISIS.

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Iraqi Shiite fighters cover their ears as a rocket is launched during a clash with ISIS militants in the town of Al-Alam, Iraq, on Monday, March 9.

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Displaced Assyrian women who fled their homes due to ISIS attacks pray at a church on the outskirts of Damascus, Syria, on Sunday, March 1. ISIS militants abducted at least 220 Assyrians in Syria.

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Safi al-Kasasbeh, right, receives condolences from tribal leaders at his home village near Karak, Jordan, on Wednesday, February 4. Al-Kasasbeh's son, Jordanian pilot Moath al-Kasasbeh, was burned alive in a video that was recently released by ISIS militants. Jordan is one of a handful of Middle Eastern nations taking part in the U.S.-led military coalition against ISIS.

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A Kurdish marksman looks over a destroyed area of Kobani on Friday, January 30, after the city had been liberated from the ISIS militant group. The Syrian city, also known as Ayn al-Arab, had been under assault by ISIS since mid-September.

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Kurdish people celebrate in Suruc, Turkey, near the Turkish-Syrian border, after ISIS militants were expelled from Kobani on Tuesday, January 27.

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Collapsed buildings are seen in Kobani on January 27 after Kurdish forces took control of the town from ISIS.

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Junko Ishido, mother of Japanese journalist Kenji Goto, reacts during a news conference in Tokyo on Friday, January 23. ISIS would later kill Goto and another Japanese hostage, Haruna Yukawa.

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ISIS militants are seen through a rifle's scope during clashes with Peshmerga fighters in Mosul, Iraq, on Wednesday, January 21.

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An elderly Yazidi man arrives in Kirkuk after being released by ISIS on Saturday, January 17. The militant group released about 200 Yazidis who were held captive for five months in Iraq. Almost all of the freed prisoners were in poor health and bore signs of abuse and neglect, Kurdish officials said.

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Smoke billows behind an ISIS sign during an Iraqi military operation to regain control of the town of Sadiyah, about 95 kilometers (60 miles) north of Baghdad, on Tuesday, November 25.

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Fighters from the Free Syrian Army and the Kurdish People's Protection Units join forces to fight ISIS in Kobani on Wednesday, November 19.

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A picture taken from Turkey shows smoke rising after ISIS militants fired mortar shells toward an area controlled by Syrian Kurdish fighters near Kobani on Monday, November 3.

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Iraqi special forces search a house in Jurf al-Sakhar, Iraq, on Thursday, October 30, after retaking the area from ISIS.

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ISIS militants stand near the site of an airstrike near the Turkey-Syria border on Thursday, October 23. The United States and several Arab nations have been bombing ISIS targets in Syria to take out the militant group's ability to command, train and resupply its fighters.

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Kurdish fighters walk to positions as they combat ISIS forces in Kobani on Sunday, October 19.

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Heavy smoke rises in Kobani following an airstrike by the U.S.-led coalition on October 18.

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Cundi Minaz, a female Kurdish fighter, is buried in a cemetery in the southeastern Turkish town of Suruc on Tuesday, October 14. Minaz was reportedly killed during clashes with ISIS militants in nearby Kobani.

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Kiymet Ergun, a Syrian Kurd, celebrates in Mursitpinar, Turkey, after an airstrike by the U.S.-led coalition in Kobani on Monday, October 13.

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Alleged ISIS militants stand next to an ISIS flag atop a hill in Kobani on Monday, October 6.

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A Kurdish Peshmerga soldier who was wounded in a battle with ISIS is wheeled to the Zakho Emergency Hospital in Duhuk, Iraq, on Tuesday, September 30.

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Syrian Kurds wait near a border crossing in Suruc as they wait to return to their homes in Kobani on Sunday, September 28.

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A elderly man is carried after crossing the Syria-Turkey border near Suruc on Saturday, September 20.

Kurdish Peshmerga fighters fire at ISIS militant positions from their position on the top of Mount Zardak, east of Mosul, Iraq, on Tuesday, September 9.

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Displaced Iraqis receive clothes from a charity at a refugee camp near Feeshkhabour, Iraq, on Tuesday, August 19.

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Aziza Hamid, a 15-year-old Iraqi girl, cries for her father while she and some other Yazidi people are flown to safety Monday, August 11, after a dramatic rescue operation at Iraq's Mount Sinjar. A CNN crew was on the flight, which took diapers, milk, water and food to the site where as many as 70,000 people were trapped by ISIS. But only a few of them were able to fly back on the helicopter with the Iraqi Air Force and Kurdish Peshmerga fighters.

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Thousands of Yazidis are escorted to safety by Kurdish Peshmerga forces and a People's Protection Unit in Mosul on Saturday, August 9.

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Thousands of Yazidi and Christian people flee Mosul on Wednesday, August 6, after the latest wave of ISIS advances.

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A Baiji oil refinery burns after an alleged ISIS attack in northern Selahaddin, Iraq, on Thursday, July 31.

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A Syrian rebel fighter lies on a stretcher at a makeshift hospital in Douma, Syria, on Wednesday, July 9. He was reportedly injured while fighting ISIS militants.

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Children stand next to a burnt vehicle during clashes between Iraqi security forces and ISIS militants in Mosul on Tuesday, June 10.

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Under the rules of engagement, U.S. Special Operations forces must have continuous surveillance of a target for a period of time to ensure they know who is there and the locations of any potential nearby civilians before they strike.

The U.S. has said all Special Operations missions are coordinated with the Iraqi government.

Vice President Joe Biden has spoken to Iraqi Prime Minister Haider al-Abadi twice in the last week, though White House readouts of the call did not mention the detainee.

It could not immediately be learned if there were Iraqi forces took part in the raid to capture the man, or whether Iraqis were involved in the airstrikes.

Director of National Intelligence James Clapper recently hinted at the confirmation of chemical attacks by ISIS in congressional testimony.

"Chemical weapons continue to pose a threat in Syria and Iraq," Clapper told the House intelligence committee. "ISIL has also used toxic chemicals in Iraq and Syria, including the blister agent Sulfur Mustard. (It's) the first time an extremist group has produced and used a chemical warfare agent in an attack since Aum Shinrikyo used sarin in Japan in 1995."

Defense officials said this was the first public confirmation by the U.S. government of mustard agent attacks.

The Organization for the Prohibition of Chemical Weapons also continues to track reports of the use of mustard agent and is talking with the U.S. about other possible attacks, U.S. officials said.

Investigators will also want to know whether ISIS has any plans to use chemical agents in attacks against the West. It's unclear whether the captured operative has that knowledge.